Treatment of mineral and vegetable oils.



LAND.

TREATMENT No Drawing.

UNITED STATES JOHN JAMES Econ Ann ALFRED eonnon sAEAMon,

PATENT oEEIoE.

OF LONDON, ENGLAND, ASSIGNORS TO THE OIL REFINING IMrEovEMENTs COMPANY, LIMITED, 0E GLASGOW, scor- Application filed July To all whom it may concern: 7 1

Be it known that we, JOHN JAMES H001) and ALFRED GORDON SALAMON, subjects of the King of Great Britain, both residing at 1 Fenchurch avenue, London, England, have invented new and useful Improvements in the Treatment of Mineral and Vegetable Oils, of which the following is a specification.

The object of the inventionis toefliciently dccolorize, and in some instances deodorize, for commercial purposes, crude oil whether mineral oil or vegetable oil, such for instance as cotton seed oil and wood oil, or the fractionated productsthereof. This is eifected by using as a filteringmaterial for the crude or fractionated oilchemically precipitated magnesia which has been very thoroughly washed dried and ignited below bri ht redness, i. e. to a dull redheat for a su cient time to render it practically anhy drous. When magnesia is preci itated it appears in the hydrated form Mg 1-1 0 and this molecule of water is removed by the heating. Moreover in order to obtain the maximumof eiiiciency of the filtering material it is desirableito protect it as far as possible from atmospheric influence after heating until such time' as it is brought into contact with the oil.

The amount of oil that can be passed through a given weight and volume of the filtering material will vary with the commercial requirements in respect of the color of the oil, but it is found that satisfactoryresults can be obtained by using a series of two or more filtering vessels, and ultimately using the\last or catch vessel as the first vessel of the series, but we do not restrict ourselves to this method of employing the material. When the material is no longer satisfactory it can generally be again fitted for use by distilling off the absorbed oil, driving it out with steam or washing it out with light petroleum ether according to circumstances and then igniting for asuitable time at a dull red heat.

In treating thick dark viscid oils such as the fractions intended for lubricating purposes or crude cotton seed oil, we proceed as follows :--The viscid oil is dissolved in a suitable volume of light petroleum spirit,

- Specification of Letters Patent.

OE MINERAL AND VEGETABLE OILS.

I such volume being determined for each particular dark oil experimentally, and the solution is passed through the filtering medium.

The latter is then Washed with such spirit, K and the resulting filtrate and washings distilled; such distillation'may be carried on continuously, the filtrate being run in a continuous stream from the filters to the still. The light spirit so used is collected and may be use again for similar purposes.

It is found thatgenerally the lower the boiling point of the spirit the greater its efliciency, and also spirit which reacts to any marked extent when treated with bromin is not so efiicient as one that will not readily react with bromin. Nithout attempting to describe the theory underlying these observations we desire to point out that as the result of experiments a considerable variation is found in the efi'iciency of therefore it is necessary to make a preliminary test of the light spirit by mixing it with the oil to mixture through the filtering material. The selection of .the light spirit for efiicie'nt use,

should depend upon the results thus obtained. l a

In our application for patent No. 560,916, filed May 12, 1910, we ess of decolorizing oil, consisting in filtering oil through material prepared by igniting magnesite-to a dull red heat. I

What we claim is I 1. The process hereindescribed ofdecolor- 'izing oil which consists in filtering it through magnesia prepared by first precipitating magnesium hydrate and then rendering the magnesia anhydrous by ignition.

2. The process hereindescribed of decolorizing light petroleumspirit, through magnesia re ared by first precipitatin magnesium y rate and then rendering t e ma esia anhydrous by ignition and finally distillingthe filtrate.

JOHN J MES HOOD. ALFRED GORDON SALAMON. Witnesses: I

R. B. Rnnsronn, H. J. LEWIS.

that generally a lightavailable light spirits and be treated and passing the have claimed a proc- Patented June as, 1910. 26,1909. Serial No. 509,591. t

oil which consists in dissolving it in filtering the solution 

